采用UTF-8格式导出Excel存在乱码解决方法

目前我们开发Excel导出时，多数使用ExportToExcelCommon类导出Excel，通常情况下不会产生乱码，但在某些时候还是会产生乱码。解决方法很简单，只需要在ExportToExcel()方法中多加一句代码即可，ExportToExcel()方法如下：

string fileName;
            HttpContext.Current.Response.Buffer = true;
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ClearHeaders();
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.Charset = "UTF-8";
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
            HttpContext.Current.Response.HeaderEncoding = System.Text.Encoding.UTF8;

            fileName = string.Format("AOMS Export-{0:yyyy-MM-dd_HH_mm_ss}.xls", DateTime.Now);
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
            //设置输出文件类型为excel文件。
            HttpContext.Current.Response.ContentType = "application/ms-excel";
            StringWriter tw = new System.IO.StringWriter();
            HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
            gvw.RenderControl(hw);
            if (!string.IsNullOrEmpty(title))
            {
                HttpContext.Current.Response.Write("<b><center><font size=3 face=Verdana color=#0000FF>" + title + "</font></center></b>");
            }
            HttpContext.Current.Response.Write("<meta http-equiv=\"content-type\" content=\"application/ms-excel; charset=UTF-8\"/>");
            HttpContext.Current.Response.Write(tw.ToString());
            HttpContext.Current.Response.Flush();
            HttpContext.Current.Response.Close();
            HttpContext.Current.Response.End();

            gvw.Dispose();
            tw.Dispose();
            hw.Dispose();

            gvw = null;
            tw = null;
         hw = null;
注意上述代码的重点在于这一句：
HttpContext.Current.Response.Write("<meta http-equiv=\"content-type\" content=\"application/ms-excel; charset=UTF-8\"/>");
在导出方法中加入这一句代码，即可防止采用UTF-8格式导出Excel时出现乱码。